Caster



FIG. 1 is an elevational view of a caster according to the presentinvention;

FIG. 2 is a rear elevational view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a left side view of FIG. 1;

FIG. 5 is a right side view of FIG. 1;

FIG. 6 is a bottom view of FIG. 1; and

FIG. 7 is a longitudinal sectional view, taken along the line VII--VIIin FIG. 1.

The ornamental design for "a caster", substantially as shown.